(A) The number of radial nodes in an orbital is given by the formula $(n - l - 1)$.For a $2s$ orbital,the principal quantum number $n = 2$ and the azi

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(A) The number of radial nodes in an orbital is given by the formula $(n - l - 1)$.For a $2s$ orbital,the principal quantum number $n = 2$ and the azimuthal quantum number $l = 0$.Therefore,the number of radial nodes $= 2 - 0 - 1 = 1$.Thus,the correct option is $A$.